Lead screw sizing is a bit of a hybrid exercise, with similarities to the process of ball screw sizing, but incorporating some of the considerations that come with sizing a plain bearing. While many factors are involved in the selection of a specific lead screw assembly, lead screw sizing — choosing the right diameter and […]
PV Equation: How to calculate the PV value for a lead screw application
Lead screws rely on sliding friction between the nut and the screw to convert rotary motion into axial (thrust) force to move a load. Most lead screw designs use either a carbon steel screw with a bronze nut, or a stainless steel screw with a plastic nut. In either case, there are no recirculating balls […]
Motion Trends: 3D printing aides lead screw design, prototyping
A number of trends in the motion industry are impacting lead screw design and implementation. One of these is the miniaturization of components. For instance, applications in optics as well as medical devices demand high precision, and smaller miniature lead screws can meet high precision specifications and can fit where space is limited and where […]
Motion Trends: Better performing, more customized ball screws
Slow but steady improvements continue with ball screw technology. For instance, developments in manufacturing and materials have improved ball screw performance so that the most recent generation of ball screws have greater load densities than before, leading to high load capacities in smaller packages. A trend that continues is the adoption of ball screws into […]
Is oil suitable for ball screw lubrication?
The short answer is yes: ball screws can be lubricated with either grease or oil. Grease is more commonly used for ball screw lubrication because it doesn’t entail complicated delivery methods, and it requires less frequent re-lubrication intervals. But despite the simplicity of using grease, in many applications, oil lubrication is the better choice for […]
How to improve ball screw rigidity (with support-bearing selection and more)
Updated May 2019 || Ball screw rigidity depends not only on the screw shaft and ball nut, but also on the thrust bearings and on the ball nut and bearing housings. Where: Rtot = Rigidity of the screw system (N/μm) RS = Rigidity of the screw shaft (N/μm) RN = Rigidity of the ball nut (N/μm) RB […]
What makes miniature ball screws unique?
Ball screws are used in a wide variety of applications, but some of the most challenging are those on the extreme ends of the performance spectrum – from large diameter, large lead screws for machine tools, to screws with small diameters and very fine leads for optical and medical applications. For very small, high-precision movements, […]
Helix Linear Technologies website — new at helixlinear.com
Helix Linear Technologies now has a new and refreshed website at helixlinear.com. The updated site includes several new lead screw and linear actuator products that deliver smooth, clean and quite linear motion solutions. The manufacturer’s goal with this new website is to provide visitors an easier way to learn about Helix Linear’s products. The new […]
Roller screw actuators: Design and applications
Electromechanical actuators come in many varieties, with common drive mechanisms being lead screws, ball screws, and roller screws. When a designer or user wants to transition from hydraulics or pneumatics to electromechanical motion, roller screw actuators are usually the best choice. They provide comparable performance characteristics to hydraulics (high force) and pneumatics (high speed), in […]
Can-stack linear actuators: How the motor and screw components work
Can-stack linear actuators are one type of stepper-motor design that converts rotary to linear motion with a built-in leadscrew. The linear actuators incorporate can-stack motors — sometimes called claw-tooth step motors, tin-can stepper motors, or claw-pole motors — leverage low-cost construction with punched sheet-metal parts that form toothed (or clawed) cups surrounding bobbin coils. Common […]
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